AI Data Center Packaging And Photonics Will Drive Powerful Long-Term Upside

Catalysts

About ASE Technology Holding

ASE Technology Holding provides semiconductor assembly, advanced packaging and testing services for high performance computing and AI applications.

What are the underlying business or industry changes driving this perspective?

• Rapid growth in AI data center spending, with Q2 2025 CapEx from eight hyperscalers at US$87b and revenue related CapEx ratios above 45%, points to sustained demand for AI compute packaging and is likely to support ASE's advanced packaging revenue mix and scale.
• The shift toward fewer AI devices with much higher value per unit since 2024, where revenue per device rises despite modest volume growth, rewards ASE's high value add packaging platforms such as VIPack and FOCoS, which can support higher average selling prices and potentially higher gross margins.
• Industry roadmaps calling for more HBM per GPU, larger package sizes and higher bandwidth, together with ASE's FOCoS Bridge and large panel solutions that raise wafer utilization from 57% to 87%, position the company to serve complex AI chips at scale, which can benefit revenue and manufacturing efficiency.
• Rising rack power levels, including reference points up to 600 kilowatts and work on 800 volt DC architectures, create a need for advanced power delivery such as ASE's powerSiP and vertical regulation closer to the die, which can increase ASE's content per system and support margins in power related modules.
• The move from purely electronic to combined electronic and photonic data movement in data centers, supported by ASE's silicon photonics packaging, CPO test vehicles and submicron alignment capabilities, may expand its role in AI interconnects and add new revenue streams tied to high end networking and optical engines.

Assumptions

How have these above catalysts been quantified?

• This narrative explores a more optimistic perspective on ASE Technology Holding compared to the consensus, based on a Fair Value that aligns with the bullish cohort of analysts.
• The bullish analysts are assuming ASE Technology Holding's revenue will grow by 28.8% annually over the next 3 years.
• The bullish analysts assume that profit margins will increase from 7.0% today to 12.5% in 3 years time.
• The bullish analysts expect earnings to reach NT$178.8 billion (and earnings per share of NT$43.79) by about July 2029, up from NT$47.3 billion today. However, there is some disagreement amongst the analysts with the more bearish ones expecting earnings as low as NT$113.0 billion.
• In order for the above numbers to justify the price target of the more bullish analyst cohort, the company would need to trade at a PE ratio of 29.2x on those 2029 earnings, down from 62.9x today. This future PE is lower than the current PE for the US Semiconductor industry at 49.2x.
• The bullish analysts expect the number of shares outstanding to grow by 0.9% per year for the next 3 years.
• To value all of this in today's terms, we will use a discount rate of 11.27%, as per the Simply Wall St company report.

Risks

What could happen that would invalidate this narrative?

• AI data center CapEx is currently highly concentrated in a small group of eight hyperscalers, and management has not indicated how resilient this spending would be if these customers slow their investment cycle. This could weigh on ASE Technology Holding's advanced packaging revenue and earnings power over time.
• The industry is pushing for ever larger and more complex packages, such as 100 by 100 millimeter modules with up to 16 HBM stacks. ASE Technology Holding is still moving from low utilization on 300 millimeter wafers to panel solutions that are only beginning to qualify, so any delay in ecosystem readiness or customer migration to panels could limit yield gains and restrict improvement in gross margins.
• Several growth themes that ASE Technology Holding is investing in, such as silicon photonics, CPO optical engines and high voltage 800 volt DC data center power delivery, are at an early revenue stage according to management and may take longer than expected to scale. This would constrain diversification benefits and slow any uplift in long term revenue mix and operating margins.
• Advanced power and thermal solutions like powerSiP vertical regulation and potential direct to silicon liquid cooling are technically complex and rely on customer specific PMIC chips and new materials. Execution or reliability challenges could increase manufacturing costs, compress gross margins and lead to additional capital requirements before these offerings contribute meaningfully to earnings.
• ASE Technology Holding positions itself as benefiting from the move away from monolithic chips toward chiplets and heterogeneous integration, but management also indicates that some technologies such as panel level packaging and full process CPO are not yet in mass adoption. This means competitors or foundry partners could capture a larger share of high value packaging, limiting ASE's long term revenue growth and margin expansion from these trends.

Valuation

How have all the factors above been brought together to estimate a fair value?

• The assumed bullish price target for ASE Technology Holding is NT$840.0, which represents up to two standard deviations above the consensus price target of NT$626.35. This valuation is based on what can be assumed as the expectations of ASE Technology Holding's future earnings growth, profit margins and other risk factors from analysts on the bullish end of the spectrum.
• However, there is a degree of disagreement amongst analysts, with the most bullish reporting a price target of NT$840.0, and the most bearish reporting a price target of just NT$350.0.
• In order for you to agree with the more bullish analyst cohort, you'd need to believe that by 2029, revenues will be NT$1432.4 billion, earnings will come to NT$178.8 billion, and it would be trading on a PE ratio of 29.2x, assuming you use a discount rate of 11.3%.
• Given the current share price of NT$677.0, the analyst price target of NT$840.0 is 19.4% higher.
• We always encourage you to reach your own conclusions though. So sense check these analyst numbers against your own assumptions and expectations based on your understanding of the business and what you believe is probable.